Past Events

In recent years, perovskite solar cells (PSCs) have become a research focus in the field of photovoltaics. The efficiency of PSCs has increased from 3.8% (in 2009) to 25.2% (in 2019) in only a few years, which is close to the laboratory record (26.7%) of single-junction based silicon solar cells, while for silicon-perovskite tandem solar cell, the record has jumped up to 28.2%. The improvement in device performances is attributed to the unique characteristics such as a broad spectral absorption range, very high absorption coefficient, high carrier mobility, longer diffusion length, and longer carrier lifetime.

Nonetheless, there are still mysteries about how the solar cells behave during current–voltage measurement and problems related to performance degradation, even in ambient environment. The stability of PSC devices is mainly caused by the perovskite layer and other functional layers. Researchers have tried a lot of ways to improve its stability, such as adjusting the stoichiometric ratio of different components, replacing one or above components with new element or atom groups, modifying the interface between layers, developing new electron or hole transport material, protecting the devices with epoxies to prevent moisture and oxygen, and so on.

This seminar will focus on the factors limiting the stability of PSCs, such as moisture, oxygen, light, and heat. Meantime, some recent and useful strategies will be discussed, such as perovskite composition, structure optimization, interface modification, charge transport material improvement, as well as encapsulation.